Effect of wall thickness on the end corrections of the extended inlet and outlet of a double-tuned expansion chamber
Effect of wall thickness on the end corrections of the extended inlet and outlet of a double-tuned expansion chamber
Simple expansion chambers, the simplest of the muffler configurations, have very limited practical application due to the presence of periodic troughs in the transmission loss spectrum which drastically lower the overall transmission loss of the muffler. Tuned extended inlet and outlet can be designed to nullify three-fourths of these troughs, making use of the plane wave theory. These cancellations would not occur unless one altered the geometric lengths for the extended tube in order to incorporate the effect of evanescent higher-order modes (multidimensional effect) through end corrections or lumped inertance approximation at the area discontinuities or junctions. End corrections of the extended inlet and outlet have been studied by several researchers. However the effect of wall thickness of the inlet/outlet duct on end correction has not been studied explicitly. This has significant effect on the tuning of an extended inlet/outlet expansion chamber. It is investigated here experimentally as well as numerically (through use of 3-D FEM software) for stationary medium.
65-70
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Munjal, M.L.
ba43c325-ed0a-48b1-82c6-7efcc77834a0
1 January 2011
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Munjal, M.L.
ba43c325-ed0a-48b1-82c6-7efcc77834a0
Paruchuri, Chaitanya and Munjal, M.L.
(2011)
Effect of wall thickness on the end corrections of the extended inlet and outlet of a double-tuned expansion chamber.
Applied Acoustics, 72 (1), .
(doi:10.1016/j.apacoust.2010.09.001).
Abstract
Simple expansion chambers, the simplest of the muffler configurations, have very limited practical application due to the presence of periodic troughs in the transmission loss spectrum which drastically lower the overall transmission loss of the muffler. Tuned extended inlet and outlet can be designed to nullify three-fourths of these troughs, making use of the plane wave theory. These cancellations would not occur unless one altered the geometric lengths for the extended tube in order to incorporate the effect of evanescent higher-order modes (multidimensional effect) through end corrections or lumped inertance approximation at the area discontinuities or junctions. End corrections of the extended inlet and outlet have been studied by several researchers. However the effect of wall thickness of the inlet/outlet duct on end correction has not been studied explicitly. This has significant effect on the tuning of an extended inlet/outlet expansion chamber. It is investigated here experimentally as well as numerically (through use of 3-D FEM software) for stationary medium.
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Published date: 1 January 2011
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Local EPrints ID: 435313
URI: http://eprints.soton.ac.uk/id/eprint/435313
ISSN: 0003-682X
PURE UUID: f4810f40-aa73-437a-b4af-a468cf512058
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Date deposited: 30 Oct 2019 17:30
Last modified: 16 Mar 2024 04:51
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M.L. Munjal
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